/*************************************************** 
 This is a library for the MCP23017 i2c port expander

 These displays use I2C to communicate, 2 pins are required to
 interface
 Adafruit invests time and resources providing this open source code,
 please support Adafruit and open-source hardware by purchasing
 products from Adafruit!

 Written by Limor Fried/Ladyada for Adafruit Industries.
 BSD license, all text above must be included in any redistribution
 ****************************************************/

#ifndef _Adafruit_MCP23017_H_
#define _Adafruit_MCP23017_H_

#include <stdint.h>

#include "HostI2cBus.hpp"
#include "LoggerFactory.hpp"

#define INPUT 0x01
#define OUTPUT 0x00

#define MCP23017_ADDRESS 0x20

// registers
#define MCP23017_IODIRA 0x00
#define MCP23017_IPOLA 0x02
#define MCP23017_GPINTENA 0x04
#define MCP23017_DEFVALA 0x06
#define MCP23017_INTCONA 0x08
#define MCP23017_IOCONA 0x0A
#define MCP23017_GPPUA 0x0C
#define MCP23017_INTFA 0x0E
#define MCP23017_INTCAPA 0x10
#define MCP23017_GPIOA 0x12
#define MCP23017_OLATA 0x14

#define MCP23017_IODIRB 0x01
#define MCP23017_IPOLB 0x03
#define MCP23017_GPINTENB 0x05
#define MCP23017_DEFVALB 0x07
#define MCP23017_INTCONB 0x09
#define MCP23017_IOCONB 0x0B
#define MCP23017_GPPUB 0x0D
#define MCP23017_INTFB 0x0F
#define MCP23017_INTCAPB 0x11
#define MCP23017_GPIOB 0x13
#define MCP23017_OLATB 0x15

namespace pmx
{
class Adafruit_MCP23017
{

private:
	/*!
	 * \brief Retourne le \ref Logger associé à la classe \ref Md25.
	 */
	static const utils::Logger & logger()
	{
		static const utils::Logger & instance = utils::LoggerFactory::logger("pmx::Adafruit_MCP23017");
		return instance;
	}

	bool connected_;

	uint8_t i2caddr;
	utils::HostI2cBus MCP_i2c_;

public:

	void begin(void);

	void pinMode(uint8_t p, uint8_t d);
	void digitalWrite(uint8_t p, uint8_t d);
	void pullUp(uint8_t p, uint8_t d);
	uint8_t digitalRead(uint8_t p);

	void writeGPIOAB(uint16_t);
	uint16_t readGPIOAB();

	void write_i2c(uchar command, uchar value);
	int read_i2c(uchar command);
	char* readI2c_2Byte();
	void writeI2c_3Bytes(const char *buf);

};
}

#endif
